Exercise bicycle



FIG. 1 is a front elevation of the exercise bicycle;

FIG. 2 is a rear elevation of the exercise bicycle;

FIG. 3 is a top plan view of the exercise bicycle;

FIG. 4 is a bottom plan view of the exercise bicycle;

FIG. 5 is a right side elevation of the exercise bicycle;

FIG. 6 is a left side elevation of the exercise bicycle;

FIG. 7 is a three-quarter perspective view taken from the front right of the exercise bicycle; and,

FIG. 8 is a three-quarter perspective view taken from the left rear of the exercise bicycle. 

The ornamental design for an exercise bicycle, as shown. 